-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

=============================================================================
FreeBSD-EN-20:15.mps                                            Errata Notice
                                                          The FreeBSD Project

Topic:          Kernel panic in mps(4) driver

Category:       core
Module:         mps
Announced:      2020-07-08
Affects:        All supported version of FreeBSD.
Corrected:      2020-06-11 14:48:20 UTC (stable/12, 12.1-STABLE)
                2020-07-08 19:58:00 UTC (releng/12.1, 12.1-RELEASE-p7)
                2020-06-11 14:49:38 UTC (stable/11, 11.4-STABLE)
                2020-07-08 19:58:00 UTC (releng/11.4, 11.4-RELEASE-p1)
                2020-07-08 19:58:00 UTC (releng/11.3, 11.3-RELEASE-p11)

For general information regarding FreeBSD Errata Notices and Security
Advisories, including descriptions of the fields above, security
branches, and the following sections, please visit
<URL:https://security.FreeBSD.org/>.

I.   Background

mps(4) is a disk controller driver.  It exports an ioctl(2) interface used by
several command-line utilities to query for or set properties of the device.

II.  Problem Description

mps(4) implements a pass-through interface which allows privileged user
processes to submit commands directly to disks behind the controller.  A bug
in the code which copies command results out to the requesting process could
cause a kernel panic.

III. Impact

Administrative commands issued by, e.g., sas2ircu, could cause a kernel panic.

IV.  Workaround

No workaround is available.  Systems that do not use mps(4) are unaffected.

V.   Solution

Upgrade your system to a supported FreeBSD stable or release / security
branch (releng) dated after the correction date and reboot.

Perform one of the following:

1) To update your system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install
# shutdown -r +10min "Rebooting for errata update"

2) To update your system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch https://security.FreeBSD.org/patches/EN-20:15/mps.patch
# fetch https://security.FreeBSD.org/patches/EN-20:15/mps.patch.asc
# gpg --verify mps.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile your kernel as described in
<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
system.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/12/                                                        r362057
releng/12.1/                                                      r363024
stable/11/                                                        r362058
releng/11.4/                                                      r363024
releng/11.3/                                                      r363024
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223813>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:15.mps.asc>
-----BEGIN PGP SIGNATURE-----
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=6tC9
-----END PGP SIGNATURE-----
